Sister chromosome exchanges are recombination events that occur between homologous chromosomes and are often the result of exposure of the cell to DNA damaging agents.
Cross over, or recombination, is the exchange of chromosome segments between non sister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.
Tapping on the patellar tendon stretches<span> receptors called the </span>muscle<span> spindles in the</span>quadriceps muscle group<span> of the anterior thigh. This stimulus evokes a rapid motor</span>reflex<span> to </span>contract<span> the </span>quadriceps<span> and shorten the </span><span>muscles</span>
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D. the population must be indefinitely large
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Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy. ... For 2018 alone, global fossil fuel emissions reached 10 ± 0.5 Pg C yr−1 for the first time in history (Friedlingstein et al. 2019). About half of the CO₂ emitted since 1850 remains in the atmosphere.
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